Re: [PATCH 3/3] pwm: imx: Implement get_state() function for hardware readout

[Thierry Reding <thierry.reding@gmail.com>]

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On Mon, Oct 01, 2018 at 04:19:48PM +0200, Michal Vokáč wrote:
> Implement the get_state() function and set the initial state to reflect
> real state of the hardware. This allows to keep the PWM running if it was
> enabled in bootloader. It is very similar to the GPIO behavior. GPIO pin
> set as output in bootloader keep the same setting in Linux unless it is
> reconfigured.
> 
> If we find the PWM block enabled we need to prepare and enable its source
> clock otherwise the clock will be disabled late in the boot as unused.
> That will leave the PWM in enabled state but with disabled clock. That has
> a side effect that the PWM output is left at its current level at which
> the clock was disabled. It is totally non-deterministic and it may be LOW
> or HIGH.
> 
> Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com>
> ---
>  drivers/pwm/pwm-imx.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)

Applied, thanks.

Thierry

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